Vessel Density Grid 2013

This dataset contains the average weekly shipping density for the whole of the UK at a 2km grid resolution. For 2013, AIS datasets were sampled from the first seven days of each month, commencing with January,at monthly intervals.The total value for all 12 weeks were divided by 12 to determine the weekly average for each vessel group, therefore decimal values may occur for certain cells. The weekly average of all vessel groups were multiplied by 52 to provide the estimated annual average. Please note that the grid used to calculate this dataset is not consistent with that of 2011, 2012 and 2015 data. The data will be recalculated to provide consistent data as soon as possible. The field headings in the attribute table are as follows: 0 - Unknown Vessels 1 - Non-Port service craft 2 - Port service craft 3 - Vessels engaged in dredging or underwater operations 4 - High Speed Craft 5 - Military or Law enforcement 6 - Passenger 7 - Cargo 8 - Tankers 9 - Fishing vessels 10 - Recreational vessels Weekly_Ave - Weekly Average of all vessels Annual_Ave - Estimated annual density for all vessels本数据集包含英国全域2km网格分辨率下的周均航运密度数据。2013年的自动识别系统（Automatic Identification System，AIS）数据集以月为采样间隔，自每年1月起抽取当月前7天的数据；将12周的总数值除以12，即可得到各船舶类别的周均密度，因此部分网格单元的数值可能为小数。将所有船舶类别的周均密度乘以52，即可得到估算的年度平均密度。请注意，本次计算所用的网格与2011、2012及2015年数据集的网格并不统一，团队将尽快重新计算以生成一致的数据集。 属性表中的字段名称如下： 0 - 未知船舶（Unknown Vessels） 1 - 非港口服务艇（Non-Port service craft） 2 - 港口服务艇（Port service craft） 3 - 从事疏浚或水下作业的船舶（Vessels engaged in dredging or underwater operations） 4 - 高速船舶（High Speed Craft） 5 - 军事或执法船舶（Military or Law enforcement） 6 - 客运船舶（Passenger） 7 - 货运船舶（Cargo） 8 - 油轮（Tankers） 9 - 捕捞船舶（Fishing vessels） 10 - 休闲船舶（Recreational vessels） Weekly_Ave - 所有船舶的周平均密度 Annual_Ave - 所有船舶的估算年度平均密度